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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: SimpleKVTransaction.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.simple;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.Arrays;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.Iterator;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.SortedSet;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.TreeSet;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.kv.AbstractKVStore;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.kv.KVPair;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.kv.KVPairIterator;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.kv.KVTransaction;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.kv.KeyRange;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.kv.mvcc.LockOwner;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.jsimpledb.util.ByteUtil;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.slf4j.LoggerFactory;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>/**<a name="line.24"></a>
<span class="sourceLineNo">025</span> * {@link KVTransaction} implementation for {@link SimpleKVDatabase}.<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * &lt;p&gt;<a name="line.27"></a>
<span class="sourceLineNo">028</span> * Locking note: all fields in this class are protected by the Java monitor of the associated {@link SimpleKVDatabase},<a name="line.28"></a>
<span class="sourceLineNo">029</span> * not the Java monitor of this instance.<a name="line.29"></a>
<span class="sourceLineNo">030</span> * &lt;/p&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> */<a name="line.31"></a>
<span class="sourceLineNo">032</span>public class SimpleKVTransaction extends AbstractKVStore implements KVTransaction {<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>    final SimpleKVDatabase kvdb;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    final TreeSet&lt;Mutation&gt; mutations = new TreeSet&lt;&gt;(KeyRange.SORT_BY_MIN);<a name="line.35"></a>
<span class="sourceLineNo">036</span>    final LockOwner lockOwner = new LockOwner();<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    boolean stale;<a name="line.38"></a>
<span class="sourceLineNo">039</span>    long waitTimeout;<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>    /**<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * Constructor.<a name="line.42"></a>
<span class="sourceLineNo">043</span>     *<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @param kvdb associated database<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @param waitTimeout wait timeout for this transaction<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @throws IllegalArgumentException if {@code kvdb} is null<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @throws IllegalArgumentException if {@code waitTimeout} is negative<a name="line.47"></a>
<span class="sourceLineNo">048</span>     */<a name="line.48"></a>
<span class="sourceLineNo">049</span>    protected SimpleKVTransaction(SimpleKVDatabase kvdb, long waitTimeout) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>        if (kvdb == null)<a name="line.50"></a>
<span class="sourceLineNo">051</span>            throw new IllegalArgumentException("null kvdb");<a name="line.51"></a>
<span class="sourceLineNo">052</span>        this.kvdb = kvdb;<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this.setTimeout(waitTimeout);<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    @Override<a name="line.56"></a>
<span class="sourceLineNo">057</span>    public SimpleKVDatabase getKVDatabase() {<a name="line.57"></a>
<span class="sourceLineNo">058</span>        return this.kvdb;<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    @Override<a name="line.61"></a>
<span class="sourceLineNo">062</span>    public void setTimeout(long timeout) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        if (timeout &lt; 0)<a name="line.63"></a>
<span class="sourceLineNo">064</span>            throw new IllegalArgumentException("timeout &lt; 0");<a name="line.64"></a>
<span class="sourceLineNo">065</span>        this.waitTimeout = timeout;<a name="line.65"></a>
<span class="sourceLineNo">066</span>    }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>    @Override<a name="line.68"></a>
<span class="sourceLineNo">069</span>    public byte[] get(byte[] key) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>        return this.kvdb.get(this, key);<a name="line.70"></a>
<span class="sourceLineNo">071</span>    }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>    @Override<a name="line.73"></a>
<span class="sourceLineNo">074</span>    public KVPair getAtLeast(byte[] key) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>        return this.kvdb.getAtLeast(this, key);<a name="line.75"></a>
<span class="sourceLineNo">076</span>    }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    @Override<a name="line.78"></a>
<span class="sourceLineNo">079</span>    public KVPair getAtMost(byte[] key) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>        return this.kvdb.getAtMost(this, key);<a name="line.80"></a>
<span class="sourceLineNo">081</span>    }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>    @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>    public Iterator&lt;KVPair&gt; getRange(byte[] minKey, byte[] maxKey, boolean reverse) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        if (minKey == null)<a name="line.85"></a>
<span class="sourceLineNo">086</span>            minKey = ByteUtil.EMPTY;<a name="line.86"></a>
<span class="sourceLineNo">087</span>        return new KVPairIterator(this, new KeyRange(minKey, maxKey), null, reverse);<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span>    public void put(byte[] key, byte[] value) {<a name="line.91"></a>
<span class="sourceLineNo">092</span>        this.kvdb.put(this, key, value);<a name="line.92"></a>
<span class="sourceLineNo">093</span>    }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public void remove(byte[] key) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        this.kvdb.remove(this, key);<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    @Override<a name="line.100"></a>
<span class="sourceLineNo">101</span>    public void removeRange(byte[] minKey, byte[] maxKey) {<a name="line.101"></a>
<span class="sourceLineNo">102</span>        this.kvdb.removeRange(this, minKey, maxKey);<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    @Override<a name="line.105"></a>
<span class="sourceLineNo">106</span>    public void commit() {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        this.kvdb.commit(this);<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    @Override<a name="line.110"></a>
<span class="sourceLineNo">111</span>    public void rollback() {<a name="line.111"></a>
<span class="sourceLineNo">112</span>        this.kvdb.rollback(this);<a name="line.112"></a>
<span class="sourceLineNo">113</span>    }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>    // Find the mutation that overlaps with the given key, if any.<a name="line.115"></a>
<span class="sourceLineNo">116</span>    // This method assumes we are already synchronized on the associated database.<a name="line.116"></a>
<span class="sourceLineNo">117</span>    Mutation findMutation(byte[] key) {<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>        // Sanity check during unit testing<a name="line.119"></a>
<span class="sourceLineNo">120</span>        assert !this.hasOverlaps() &amp;&amp; !this.hasEmpties();<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>        // Get all mutations starting at or prior to `key' and look for overlap<a name="line.122"></a>
<span class="sourceLineNo">123</span>        final SortedSet&lt;Mutation&gt; left = this.mutations.headSet(Mutation.key(ByteUtil.getNextKey(key)));<a name="line.123"></a>
<span class="sourceLineNo">124</span>        if (!left.isEmpty()) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>            final Mutation last = left.last();<a name="line.125"></a>
<span class="sourceLineNo">126</span>            if (last.contains(key))<a name="line.126"></a>
<span class="sourceLineNo">127</span>                return last;<a name="line.127"></a>
<span class="sourceLineNo">128</span>        }<a name="line.128"></a>
<span class="sourceLineNo">129</span>        return null;<a name="line.129"></a>
<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    /**<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * Ensure transaction is eventually rolled back if leaked due to an application bug.<a name="line.133"></a>
<span class="sourceLineNo">134</span>     */<a name="line.134"></a>
<span class="sourceLineNo">135</span>    protected void finalize() throws Throwable {<a name="line.135"></a>
<span class="sourceLineNo">136</span>        try {<a name="line.136"></a>
<span class="sourceLineNo">137</span>            if (!this.stale)<a name="line.137"></a>
<span class="sourceLineNo">138</span>               LoggerFactory.getLogger(this.getClass()).warn(this + " leaked without commit() or rollback()");<a name="line.138"></a>
<span class="sourceLineNo">139</span>            this.rollback();<a name="line.139"></a>
<span class="sourceLineNo">140</span>        } finally {<a name="line.140"></a>
<span class="sourceLineNo">141</span>            super.finalize();<a name="line.141"></a>
<span class="sourceLineNo">142</span>        }<a name="line.142"></a>
<span class="sourceLineNo">143</span>    }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>    private boolean hasEmpties() {<a name="line.145"></a>
<span class="sourceLineNo">146</span>        for (Mutation mutation : this.mutations) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>            final byte[] minKey = mutation.getMin();<a name="line.147"></a>
<span class="sourceLineNo">148</span>            final byte[] maxKey = mutation.getMax();<a name="line.148"></a>
<span class="sourceLineNo">149</span>            if (minKey != null &amp;&amp; maxKey != null &amp;&amp; Arrays.equals(minKey, maxKey))<a name="line.149"></a>
<span class="sourceLineNo">150</span>                return true;<a name="line.150"></a>
<span class="sourceLineNo">151</span>        }<a name="line.151"></a>
<span class="sourceLineNo">152</span>        return false;<a name="line.152"></a>
<span class="sourceLineNo">153</span>    }<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span>    private boolean hasOverlaps() {<a name="line.155"></a>
<span class="sourceLineNo">156</span>        Mutation previous = null;<a name="line.156"></a>
<span class="sourceLineNo">157</span>        for (Mutation mutation : this.mutations) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>            if (previous != null &amp;&amp; mutation.overlaps(previous))<a name="line.158"></a>
<span class="sourceLineNo">159</span>                return true;<a name="line.159"></a>
<span class="sourceLineNo">160</span>            previous = mutation;<a name="line.160"></a>
<span class="sourceLineNo">161</span>        }<a name="line.161"></a>
<span class="sourceLineNo">162</span>        return false;<a name="line.162"></a>
<span class="sourceLineNo">163</span>    }<a name="line.163"></a>
<span class="sourceLineNo">164</span>}<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>




























































</pre>
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